|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Minerals Extraction and Processing
||Dissolution Thermodynamics of Smithsonite in Alkaline Iminodiacetate Aqueous Solution
||Dou Aichun, Yu Lei
|On-Site Speaker (Planned)
The thermodynamic model of the dissolution of smithsonite (ZnCO3) in alkaline iminodiacetate aqueous solution (Ida2--H2O system) was constructed according to the thermodynamic equilibrium equations in the system. Thermodynamic results of total concentration of Zn2+ ([Zn2+]T), free concentration of Zn2+ ([Zn2+]), free concentration of Ida2- ([Ida2-]), free concentration of CO32- ([CO32-]), species distribution of Zn2+ and species distribution of Ida2- changed with total concentration of Ida2- ([Ida2-]T) and pH value were investigated respectively at 298K. It is found that both [Ida2-]T and pH have significant effects on [Zn2+]T. [Zn2+]T increases in line with the increase of [Ida2-]T under the certain pH value. The optimal pH area for the dissolution of ZnCO3 in Ida2--H2O system is pH 8~11. In this area, [Ida2-]T increases smoothly with the increase of pH, above 90% of Ida2- is used for the formation of Zn(Ida)22-, and above 99% of Zn2+ is formed as Zn(Ida)22-.
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